Talk:Engine coolant temperature sensor

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Will this effect Emission levels?

Yes, as a secondary effect. The fuel injection computer will control injection timing (i.e. fuel quantity) on a number of factors, including temperature. If it's given an incorrect temperature reading, then it will mis-fuel. If the ECU thinks the engine is cold, it will use the cold-start settings, possibly over-fuelling dramatically, with a result of increased HC emissions and higg fuel consumption. Andy Dingley (talk) 14:57, 29 December 2012 (UTC)